diff --git a/ci/requirements_all.txt b/ci/requirements_all.txt
index e13afd619f105..5eeac95fc4457 100644
--- a/ci/requirements_all.txt
+++ b/ci/requirements_all.txt
@@ -14,7 +14,7 @@ xlwt
 html5lib
 patsy
 beautifulsoup4
-numpy
+numpy==1.14.4
 cython
 scipy
 numexpr
diff --git a/ci/requirements_dev.txt b/ci/requirements_dev.txt
index dbc4f6cbd6509..d77909df718b1 100644
--- a/ci/requirements_dev.txt
+++ b/ci/requirements_dev.txt
@@ -1,6 +1,6 @@
 python-dateutil
 pytz
-numpy
+numpy==1.14.4
 cython
 pytest>=3.1.0
 pytest-cov